feat: Adding API for ListParts

[ShreyasSinha]

1. Adding model classes for List request and response.
2. Implemented List for Multipart Upload.

Refer: #3348

[BenWhitehead]

Why is this necessary?

If I remove it and run the following test, the test passes:

  private static final class TestXmlObject2 {
    @JacksonXmlProperty(localName = "storageClass")
    private StorageClass storageClass;
  }
  @Test
  public void testParseStringValueEnum() throws IOException {
    //language=xml
    String xml = "<TestXmlObject2>\n"
        + "  <storageClass>STANDARD</storageClass>"
        + "</TestXmlObject2>";
    InputStream in = new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8));
    TestXmlObject2 expected = new TestXmlObject2(StorageClass.STANDARD);
    TestXmlObject2 actual =
        xmlObjectParser.parseAndClose(in, StandardCharsets.UTF_8, TestXmlObject2.class);
    assertThat(actual).isEqualTo(expected);
  }

[ShreyasSinha]

This is required incase we have a null string. Try to run test https://paste.googleplex.com/5523315682836480 after removing it. You'll get https://paste.googleplex.com/5523315682836480 failure.

[BenWhitehead]

Okay, but that is a deserialization issue not an enum resolution issue.

Enums can't have null values, and changing this method breaks that contract.
The exception explicitly states this fact:

Caused by: java.lang.IllegalArgumentException: Empty enum constants not allowed.
        at com.google.cloud.StringEnumType.valueOf(StringEnumType.java:66)
        at com.google.cloud.storage.StorageClass.valueOf(StorageClass.java:116)

Here is a PR that makes enum parsing work for xml without modifying any behavior or adding additional annotations: #3377

[BenWhitehead]

I'll spend some time tomorrow figuring out the dependencies failing build.

[BenWhitehead]

Applying the following patch to this branch should fix the failing dependency check

Index: google-cloud-storage/pom.xml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/google-cloud-storage/pom.xml b/google-cloud-storage/pom.xml
--- a/google-cloud-storage/pom.xml	(revision c7549b10d56e40c5576a6a7f471d7cd6f8bba397)
+++ b/google-cloud-storage/pom.xml	(date 1761754153688)
@@ -28,6 +28,14 @@
       <artifactId>jackson-datatype-jsr310</artifactId>
     </dependency>
     <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-databind</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-annotations</artifactId>
+    </dependency>
+    <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
     </dependency>

The fix can be verified locally by running mvn dependency:analyze -DfailOnWarning=true

[BenWhitehead]

Assuming my fixes in #3377 are included in the ultimate merge train, this PR can be considered done.